package com.zhinong.service.impl;

import com.alibaba.fastjson.JSONObject;
import com.zhinong.constant.MessageConstant;
import com.zhinong.dto.UserLoginDTO;
import com.zhinong.exception.LoginFailedException;
import com.zhinong.mapper.UserMapper;
import com.zhinong.properties.WeChatProperties;
import com.zhinong.service.UserService;
import com.zhinong.utils.HttpClientUtil;
import lombok.extern.slf4j.Slf4j;
import com.zhinong.entity.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.HashMap;
import java.util.Map;

@Service
@Slf4j
public class UserServiceImpl implements UserService {

    @Autowired
    private WeChatProperties weChatProperties;

    @Autowired
    private UserMapper userMapper;

    //微信服务端接口地址
    public static final String WX_LOGIN ="https://api.weixin.qq.com/sns/jscode2session";


    @Override
    public User
    wxLogin(UserLoginDTO userLoginDTO) {

        String openid = userLoginDTO.getCode();

        //判断openid是否为空，如果为空，登陆失败，抛出业务异常
        if(openid == null){
            throw new LoginFailedException(MessageConstant.LOGIN_FAILED);
        }

        if(userLoginDTO.getName() == null){
            userLoginDTO.setName("用户");
        }

        //判断当前用户是否为新用户
        User user = userMapper.getByOpenid(openid);


        //如果是新用户，自动完成注册
        if(user == null){
            user = User.builder()
                    .openid(openid)
                    .name(userLoginDTO.getName())
                    .createTime(LocalDateTime.now())
                    .build();
            userMapper.insert(user);
        }
        //返回这个用户对象
        return user;
    }

    private String getOpenid(String code){
        //调用微信接口服务，获得用户当前的openid
        Map<String, String> map = new HashMap<>();
        map.put("appid", weChatProperties.getAppid());
        map.put("secret", weChatProperties.getSecret());
        map.put("js_code",code);
        map.put("grand_type", "authorization_code");

        String json = HttpClientUtil.doGet(WX_LOGIN,map);
        JSONObject jsonObject = JSONObject.parseObject(json);
        String openid = jsonObject.getString("openid");
        return openid;
    }
}
